问题标题:
已知m-n=3,求代数式m2-n2+2m-8n-4的值
问题描述:

已知m-n=3,求代数式m2-n2+2m-8n-4的值

高宪军回答:
  m2-n2+2m-8n-4   =(m-n)(m+n)+2m-8n-4   =3m+3n+2m-8n-4   =5m-5n-4   =5(m-n)-4   =15-4   =11
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